Meninges
-3 Membranes that lie directly beneath the skull

Dura: First layer just below the cranium, it’s tough and thick like a skull cap

-Function: Limits movement of the brain within the skull

Arachnoid: Middle membrane, looks similar to a spider web

-Function: Most vessels are here

Pia: Closest membrane to the brain

-Function: Contains blood vessels which bring oxygen to the brain and carry waste products away

Hematomas

Epidural Hematoma- Collection of blood between the bone and the dura, usually following a trauma
Subdural Hematoma- Collection of blood between the Dura and Arachnoid (more common in the elderly)
Subarachnoid Hematoma- Collection of blood under the Pia mater in the brain tissue

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